Refactor / fix implicit version tests

test/EndToEnd/TestProjectCreator.cs

@@ -0,0 +1,80 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Xml.Linq;
+using Microsoft.DotNet.TestFramework;
+using Microsoft.DotNet.Tools.Test.Utilities;
+
+namespace EndToEnd
+{
+    class TestProjectCreator
+    {
+        public const string NETCorePackageName = "Microsoft.NETCore.App";
+        public const string AspNetCoreAppPackageName = "Microsoft.AspNetCore.App";
+        public const string AspNetCoreAllPackageName = "Microsoft.AspNetCore.All";
+
+
+        public string TestName { get; set; }
+        public string Identifier { get; set; }
+
+        public string PackageName { get; set; } = NETCorePackageName;
+
+        public string MinorVersion { get; set; }
+
+        public string RuntimeIdentifier { get; set; }
+
+        public TestProjectCreator([CallerMemberName] string testName = null, string identifier = "")
+        {
+            TestName = testName;
+            Identifier = identifier;
+        }
+
+        public TestAssetInstance Create()
+        {
+            var testInstance = TestBase.TestAssets.Get("TestAppSimple")
+                .CreateInstance(callingMethod: TestName, identifier: Identifier + PackageName + "_" + MinorVersion)
+                .WithSourceFiles();
+
+            string projectDirectory = testInstance.Root.FullName;
+
+            string projectPath = Path.Combine(projectDirectory, "TestAppSimple.csproj");
+
+            var project = XDocument.Load(projectPath);
+            var ns = project.Root.Name.Namespace;
+
+            //  Update TargetFramework to the right version of .NET Core
+            project.Root.Element(ns + "PropertyGroup")
+                .Element(ns + "TargetFramework")
+                .Value = "netcoreapp" + MinorVersion;
+
+            if (!string.IsNullOrEmpty(RuntimeIdentifier))
+            {
+                project.Root.Element(ns + "PropertyGroup")
+                    .Add(new XElement(ns + "RuntimeIdentifier", RuntimeIdentifier));
+            }
+            
+
+            if (PackageName != NETCorePackageName)
+            {
+                if (new Version(MinorVersion).Major < 3)
+                {
+                    //  Add ASP.NET PackageReference with implicit version for target framework versions prior to 3.0
+                    project.Root.Add(new XElement(ns + "ItemGroup",
+                        new XElement(ns + "PackageReference", new XAttribute("Include", PackageName))));
+                }
+                else
+                {
+                    project.Root.Add(new XElement(ns + "ItemGroup",
+                        new XElement(ns + "FrameworkReference", new XAttribute("Include", PackageName))));
+                }
+            }
+
+            project.Save(projectPath);
+
+            return testInstance;
+
+        }
+    }
+}